We are just finishing the building of a new home and are preparing to build a stone hearth pad for a Jotul F600. Without having the stove or OAK in hand yet is there a way that I can build the hearth so that I can just hook the OAK up. Does anyone have a picture of what an installed OAK looks like coming in to a Jotul? The air pipe will be coming up from the floor. I have talked to someone that thought that it was 4" pipe. I am just trying to rough in the pipe while building the stone pad. Thanks for any help!